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bennadel/callback_with_return.htm

Created February 1, 2012 15:19
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Use A Return Statement When Invoking Callbacks, Especially In A Guard Statement
Raw
callback_with_return.htm
<!DOCTYPE html>
<html>
<head>
<title>Using Return Statements When Invoking Callbacks</title>
<script type="text/javascript">
// Define a success handler.
var successHandler = function(){
console.log( "Success!" );
};
// Define a fail handler.
var failHandler = function(){
console.log( "Fail :(" );
};
// Now, let's create a mock function that makes use of the
// success and fail callback handlers.
var doSomething = function( successHandler, failHandler ){
// Check to see if some value is true - for a mock
// fail handler invocation.
if (true === true){
return( failHandler() );
}
// If we made it this far, then everything executed
// well - invoke success handler.
return( successHandler() );
};
/// Invoke the callback-oriented method.
doSomething( successHandler, failHandler );
</script>
</head>
<body>
<!-- Left intentionally blank. -->
</body>
</html>
Raw
callback_without_return.htm
<!DOCTYPE html>
<html>
<head>
<title>Using Return Statements When Invoking Callbacks</title>
<script type="text/javascript">
// Define a success handler.
var successHandler = function(){
console.log( "Success!" );
};
// Define a fail handler.
var failHandler = function(){
console.log( "Fail :(" );
};
// Now, let's create a mock function that makes use of the
// success and fail callback handlers.
var doSomething = function( successHandler, failHandler ){
// Check to see if some value is true - for a mock
// fail handler invocation.
if (true === true){
failHandler();
}
// If we made it this far, then everything executed
// well - invoke success handler.
successHandler();
};
/// Invoke the callback-oriented method.
doSomething( successHandler, failHandler );
</script>
</head>
<body>
<!-- Left intentionally blank. -->
</body>
</html>
Raw
synchronous_guard.htm
<!DOCTYPE html>
<html>
<head>
<title>Using Return Statements In Guard Logic</title>
<script type="text/javascript">
// A simple method including guard logic.
var doSomething = function(){
// Check some guard logic.
if (true === true){
// Return out of function exection since some
// condition indicates that the rest of the
// method should not be invoked.
return;
}
// If we made it this far, all of the guard logic
// indicated that we are good to go on execution.
return;
};
// Invoke our guarded method.
doSomething();
</script>
</head>
<body>
<!-- Left intentionally blank. -->
</body>
</html>
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